Clock



FIG. 1 is a top plan view of a clock showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image thereto;

FIG. 4 is a bottom plan view thereof.

The rear of the clock, not shown, is plain and unornamented. 

The ornamental design for a clock, as shown and described. 